Gravimetric measurements were performed to determine how the shape and size of the permeant molecules would influence their diffusion behaviour into the polyester matrix and each permeant will be discussed separately.

Increase of the temperature lowers the amount of permeant required to achieve plasticization and increases the rate at which the chains can reorganise.

On the other hand, the free-volume group of parameters require the calculation of the ratio of permeant to polymer jump size units ([xi]), which can be obtained through the glass transition temperature of the polymer [26].

It is generally recognized that the molecular composition and structure in the amorphous phase of the polymer can greatly affect its barrier properties, since the permeant molecules are believed to enter and diffuse through the polymer mostly by penetrating through its amorphous regions.

The permeant must dissolve into the barrier (the rate is governed by the solubility coefficient, S), diffuse through the barrier (governed by the diffusion constant, D) and emerge on the other side of the barrier.

CAIRO, Nov 9 (KUNA) -- Egypt on Sunday called for holding an urgent meeting at the Arab League at the level of permeant delegates to discuss the current crisis between Somali President Hassan Sheikh Mahmud and his Prime Minister Abdiweli Sheikh Ahmed.

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